CN105257241A - Method for cementing plug of horizontal well - Google Patents
Method for cementing plug of horizontal well Download PDFInfo
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- CN105257241A CN105257241A CN201510616420.7A CN201510616420A CN105257241A CN 105257241 A CN105257241 A CN 105257241A CN 201510616420 A CN201510616420 A CN 201510616420A CN 105257241 A CN105257241 A CN 105257241A
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- horizontal well
- polymer solution
- distance
- tool string
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000004568 cement Substances 0.000 claims abstract description 86
- 229920000642 polymer Polymers 0.000 claims abstract description 71
- 241000191291 Abies alba Species 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 6
- 239000003129 oil well Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 abstract description 17
- 238000007789 sealing Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 13
- 239000012530 fluid Substances 0.000 description 11
- 239000000499 gel Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000011268 mixed slurry Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000009955 starching Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 241000931705 Cicada Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for cementing a cement plug of a horizontal well, which comprises the following steps: the bottom end of the construction pipe column is lowered to a preset position in the horizontal well along a first direction; circularly washing the well to control the temperature in the well near the construction pipe column within a first temperature range; closing a casing gate of the Christmas tree, and positively extruding the polymer solution through the construction pipe column to fill the polymer solution in the well from the bottom end in a second distance along the first direction; opening a casing gate of the Christmas tree, and replacing the polymer solution through the construction pipe column to fill the polymer solution in the well at a third distance from the bottom end along the second direction; the cement slurry is just filled in through the construction pipe column; replacing the polymer solution by the construction pipe column to replace the cement slurry to a fourth distance from the bottom end along the second direction; the work string is lifted in a second direction. The invention provides a construction method for plugging by a cement plug, aiming at the difficult problem of plugging construction of an outer annular space or a short sealing part horizontal section of a horizontal well.
Description
Technical field
The present invention relates to technical field of petroleum extraction, particularly relate to a kind of method of horizontal well cementing plug.
Background technology
Cementing plug is a kind of cheap, practical, long-acting method for blocking, is widely used in all kinds of close measures of straight well.But in the application of horizontal well, such as annular chemical packing, or requiring the construction of short envelope (as only shutoff 20-50m) part of horizontal section.Due to the gravitational settling of cement paste, little consumption (can be solely a few hectolitre), to reasons such as the Flooding Efficiency of water differences, conventional cementing plug technique cannot realize the accurate placement of cement paste, thus cause constructing unsuccessfully, and forming the oil reservoir pollution and hole condition destruction that are difficult to remove, this is also the main cause that cement is difficult in horizontal well application.
Present stage, be still blank for cement in the application of horizontal well both at home and abroad, a kind of cement plug laying method of horizontal well is badly in need of in oilfield enterprise, can be used for the outer annular space of pipe of horizontal well or the plugging construction of short envelope part of horizontal section.
Summary of the invention
The embodiment of the present invention, by providing a kind of method of horizontal well cementing plug, solves the technical problem of the construction method of the outer annular space of pipe or the short envelope part of horizontal section lacking shutoff horizontal well at present.
The embodiment of the present application provides following technical scheme:
A method for horizontal well cementing plug, comprising:
By the bottom of operating tool string along first party down to precalculated position in described horizontal well; Described first direction is the direction of well head to shaft bottom of described horizontal well;
Described horizontal well is washed in circulation, to control in described horizontal well in the first temperature range apart from the temperature in region of the distance of described operating tool string in the first distance;
Close the Christmas tree casing gate of described horizontal well, by described operating tool string, positive cohering polymer solution, makes from described bottom, to expire described polymer solution along filling in the second distance of described first direction in described horizontal well;
Open described Christmas tree casing gate, by described operating tool string, just for described polymer solution, make from described bottom, to expire described polymer solution along the 3rd of second direction the apart from interior filling in described horizontal well; Described second direction is the opposite direction of described first direction;
By described operating tool string, just replacing into cement paste;
By described operating tool string, just for described polymer solution, described cement paste is replaced extremely apart from described bottom the 4th distance along described second direction;
Described operating tool string is carried along in described second direction.
Optionally, described precalculated position is specially: position residing bottom the cement plug that predetermined need are beaten.
Optionally, described first temperature range is specially: 45-60 DEG C.
Optionally, described second distance is specially 20m.
Optionally, described 3rd distance is specially 40m.
Optionally, described 4th distance is specially 5-10m.
Optionally, described polymer solution is specially hot induced polymer.
Optionally, described cement paste is specially G level oil well cement or size is more than or equal to 800 object superfine cements.
Optionally, describedly to be specially along described second direction being carried described operating tool string: carry described operating tool string along in described second direction, described bottom is made to be in position along described second direction apart from described polymer solution top the 5th distance, and horizontal well described in backwash; Carry described operating tool string along in described second direction, to the straight well section be connected with described horizontal well, and close described Christmas tree casing gate, to treat described cement slurry sets.
Optionally, described 5th distance is specially 10m.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
1, the method of the horizontal well cementing plug that the embodiment of the present application provides, first positive cohering polymer solution, again just for polymer solution, just replacing into cement paste again, and just promote cement paste to assigned address for polymer solution, and polymer solution is controlled at certain temperature range, to form high-viscosity gel fast, namely have employed the cement plug laying method of " polymer+cement+polymer ", gel slug is placed before and after cement paste, can prevent high density cement from starching the gravitational settling in horizontal segment, achieve in horizontal segment the technique effect accurately placed cement paste and prevent cement paste sedimentation.Further, by the cement plug laying method of " polymer+cement+polymer ", avoid between cement paste and the large fluid of the viscosity differences such as water or well killing fluid, the mixed slurry that direct displacement occurs, alter groove phenomenon, the technique effect with the short envelope horizontal segment of a small amount of cement paste can be realized.
2, the method for horizontal well cementing plug that provides of the embodiment of the present application, the G level oil well cement adopted or size are more than or equal to 800 object superfine cement slurries relative to other organic gels, there is the feature such as high temperature resistant, resistance to salinity, high compressive resistance, not dehydration shrinkage, be more suitable for the raising of the construction effects such as horizontal well tube outer annular space, short envelope and abandoned well.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the block diagram of horizontal well cementing plug in the embodiment of the present application;
Fig. 2 is the schematic diagram of horizontal well cementing plug in the embodiment of the present application.
Detailed description of the invention
The embodiment of the present invention, by providing a kind of method of horizontal well cementing plug, solves the construction difficult problem of the outer annular space of pipe or the short envelope part of horizontal section lacking shutoff horizontal well at present.Provide one can accurately place cement paste in horizontal segment, prevent cement paste sedimentation, and by the construction method of the short envelope horizontal segment of a small amount of cement paste.
In order to solve the technical problem that above-mentioned prior art exists, the general thought of the technical scheme that the embodiment of the present application provides is as follows:
A method for horizontal well cementing plug, comprising:
By the bottom of operating tool string along first party down to precalculated position in described horizontal well; Described first direction is the direction of well head to shaft bottom of described horizontal well;
Described horizontal well is washed in circulation, to control in described horizontal well in the first temperature range apart from the temperature in region of the distance of described operating tool string in the first distance;
Close the Christmas tree casing gate of described horizontal well, by described operating tool string, positive cohering polymer solution, makes in described horizontal well, along filling full described polymer solution in the second distance of described first direction from described bottom;
Open described Christmas tree casing gate, by described operating tool string, just for described polymer solution, make in described horizontal well, from described bottom, expiring described polymer solution along the 3rd of second direction the apart from interior filling; Described second direction is the opposite direction of described first direction;
By described operating tool string, just replacing into cement paste;
By described operating tool string, just for described polymer solution, described cement paste is replaced extremely apart from described bottom the 4th distance along described second direction;
Described operating tool string is carried along in described second direction.
Can be found out by foregoing, first positive cohering polymer solution, again just for polymer solution, just replacing into cement paste again, and just promote cement paste to assigned address for polymer solution, and polymer solution is controlled at certain temperature range, to form high-viscosity gel fast, namely have employed the cement plug laying method of " polymer+cement+polymer ", gel slug is placed before and after cement paste, can prevent high density cement from starching the gravitational settling in horizontal segment, achieve in horizontal segment the technique effect accurately placed cement paste and prevent cement paste sedimentation.Further, by the cement plug laying method of " polymer+cement+polymer ", avoid between cement paste and the large fluid of the viscosity differences such as water or well killing fluid, the mixed slurry that direct displacement occurs, alter groove phenomenon, the technique effect with the short envelope horizontal segment of a small amount of cement paste can be realized.
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In the present embodiment, provide a kind of method of horizontal well cementing plug, please refer to Fig. 1 and Fig. 2, Fig. 1 is the block diagram of horizontal well cementing plug in the embodiment of the present application, Fig. 2 is the schematic diagram of horizontal well cementing plug in the embodiment of the present application, and as shown in Figure 1, described method comprises:
Step S101, by the bottom of operating tool string along first party down to precalculated position in described horizontal well; Described first direction is the direction of well head to shaft bottom of described horizontal well;
Step S102, described horizontal well is washed in circulation, to control in described horizontal well in the first temperature range apart from the temperature in region of the distance of described operating tool string in the first distance;
Step S103, closes the Christmas tree casing gate of described horizontal well, and by described operating tool string, positive cohering polymer solution, makes in described horizontal well, along filling full described polymer solution in the second distance of described first direction from described bottom;
Step S104, opens described Christmas tree casing gate, by described operating tool string, just for described polymer solution, makes in described horizontal well, from described bottom, is expiring described polymer solution along the 3rd of second direction the apart from interior filling; Described second direction is the opposite direction of described first direction;
Step S105, by described operating tool string, is just replacing into cement paste;
Step S106, by described operating tool string, just for described polymer solution, to replace described cement paste extremely apart from described bottom the 4th distance along described second direction;
Step S107, carries described operating tool string along in described second direction.
Below in conjunction with Fig. 1 and Fig. 2, the method that the application provides is described in detail:
First, step S101 is performed, by the bottom of operating tool string 1 along precalculated position in first direction 201 times to described horizontal well 2; Described first direction 201 is the direction of well head to shaft bottom of described horizontal well 2.
In specific implementation process, described horizontal well 2 can be horizontal well or the high angle hole of sieve tube completion, and also can be horizontal well or the high angle hole of gravel pack completion, this is not restricted.
In specific implementation process, the selection of described operating tool string 1 can be determined according to the hole condition of horizontal well 2, can be blank tubing tubing string, can be also the tubing string adopting the machine tools such as centralizer, packer, bridging plug, intubate bridging plug and oil pipe to carry out assembly composition, to obtain better construction effect.
In the embodiment of the present application, described precalculated position is specially: position residing bottom the cement plug that predetermined need are beaten.
Next, perform step S102, described horizontal well 2 is washed in circulation, the temperature in interior for described horizontal well 2 region of distance in the first distance apart from described operating tool string 1 to be controlled in the first temperature range.
Specifically, clear water or well killing fluid can be used to carry out huge discharge circulation well cleanup, the consumption of described clear water or described well killing fluid, can according to well temperature before ground clear water or well killing fluid temperature, physical properties of fluids, well depth, measure, return out the parameters such as clear water temperature, pumpage and carry out heat exchange and calculate.
In the embodiment of the present application, described first temperature range is specially: 45-60 DEG C, can form high-viscosity gel fast to make polymer solution.
Subsequently, perform step S103, close the Christmas tree casing gate of described horizontal well 2, by described operating tool string, positive cohering polymer solution 3, makes in described horizontal well, along filling full described polymer solution 3 in the second distance of described first direction 201 from described bottom;
Preferably, described second distance is specially 20m.
Specifically, described polymer is specially a kind of hot induced polymer, close with clear water mobility at normal temperatures, can in 30-120S, form high-viscosity gel and have mobility within the scope of 45-60 DEG C, when continuing to be reduced to below 45 DEG C, polymer solution viscosity can be reduced to identical with clear water.Meanwhile, the initiation acid and alkali alkalescence of polymer, salinity impact, and have good compatibility with cement paste.
Subsequently, perform step S104, open described Christmas tree casing gate, by described operating tool string, just for described polymer solution 3, make in described horizontal well, from described bottom, expiring described polymer solution 3 along the 3rd of second direction 202 the apart from interior filling; Described second direction 202 is the opposite direction of described first direction 201;
Preferably, described 3rd distance is specially 40m.
Next, perform step S105, by described operating tool string, just replacing into cement paste 4.
Specifically, the described cement paste 4 just replaced replaces in well along second direction 202 from described bottom.
In specific implementation process, described cement paste 4 can be commonly used G level oil well cement or size by oil field and be more than or equal to 800 object superfine cements and prepared.To obtain the feature such as high temperature resistant, resistance to salinity, high compressive resistance, not dehydration shrinkage, the construction effects such as well casing outer annular space, short envelope and abandoned well of improving the standard.
Subsequently, perform step S106, by described operating tool string 1, just for described polymer solution 3, to replace extremely described cement paste 4 apart from described bottom the 4th distance along described second direction 202; Form the structure of " polymer+cement+polymer " shown in Fig. 2.
Preferably, described 4th distance is specially 5-10m.
Finally, perform step S107, carry described operating tool string 1 along in described second direction 202.
In the embodiment of the present application, to be describedly specially along described second direction 202 being carried described operating tool string 1:
Carry described operating tool string 1 along in described second direction 202, make described bottom be in position along described second direction 202 apart from described polymer solution 3 top the 5th distance, and horizontal well 2 described in backwash;
Carry described operating tool string 1 along in described second direction 202, to the straight well section be connected with described horizontal well 2, and close described Christmas tree casing gate, to treat that described cement paste 4 solidifies.
Preferably, described 5th distance is specially 10m.
Specifically, at the cement plug laying method of this two-fluid process synergy formation " polymer+cement+polymer " structure that the application provides, all multiactions that polymer gel can play the accurate placement positioning of assistance cement paste, prevent cement paste gravitational settling, isolates clear water and raising cement paste Flooding Efficiency.Cement paste as straight well cementing plug, can normally play the effect of packing horizontal well well and the outer annular space of screen casing.
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
1, the method of the horizontal well cementing plug that the embodiment of the present application provides, first positive cohering polymer solution, again just for polymer solution, just replacing into cement paste again, and just promote cement paste to assigned address for polymer solution, and polymer solution is controlled at certain temperature range, to form high-viscosity gel fast, namely have employed the cement plug laying method of " polymer+cement+polymer ", gel slug is placed before and after cement paste, can prevent high density cement from starching the gravitational settling in horizontal segment, achieve in horizontal segment the technique effect accurately placed cement paste and prevent cement paste sedimentation.Further, by the cement plug laying method of " polymer+cement+polymer ", avoid between cement paste and the large fluid of the viscosity differences such as water or well killing fluid, the mixed slurry that direct displacement occurs, alter groove phenomenon, the technique effect with the short envelope horizontal segment of a small amount of cement paste can be realized.
2, the method for horizontal well cementing plug that provides of the embodiment of the present application, adopt G level oil well cement or 800 orders more than superfine cement slurry relative to other organic gels, there is the feature such as high temperature resistant, resistance to salinity, high compressive resistance, not dehydration shrinkage, be more suitable for the raising of the construction effects such as horizontal well tube outer annular space, short envelope and abandoned well.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a method for horizontal well cementing plug, is characterized in that, comprising:
By the bottom of operating tool string along first party down to precalculated position in described horizontal well; Described first direction is the direction of well head to shaft bottom of described horizontal well;
Described horizontal well is washed in circulation, to control in described horizontal well in the first temperature range apart from the temperature in region of the distance of described operating tool string in the first distance;
Close the Christmas tree casing gate of described horizontal well, by described operating tool string, positive cohering polymer solution, makes from described bottom, to expire described polymer solution along filling in the second distance of described first direction in described horizontal well;
Open described Christmas tree casing gate, by described operating tool string, just for described polymer solution, make from described bottom, to expire described polymer solution along the 3rd of second direction the apart from interior filling in described horizontal well; Described second direction is the opposite direction of described first direction;
By described operating tool string, just replacing into cement paste;
By described operating tool string, just for described polymer solution, described cement paste is replaced extremely apart from described bottom the 4th distance along described second direction;
Described operating tool string is carried along in described second direction.
2. the method for claim 1, is characterized in that, described precalculated position is specially: position residing bottom the cement plug that predetermined need are beaten.
3. the method for claim 1, is characterized in that, described first temperature range is specially: 45-60 DEG C.
4. the method for claim 1, is characterized in that, described second distance is specially 20m.
5. the method for claim 1, is characterized in that, described 3rd distance is specially 40m.
6. the method for claim 1, is characterized in that, described 4th distance is specially 5-10m.
7. the method for claim 1, is characterized in that, described polymer solution is specially hot induced polymer.
8. the method for claim 1, is characterized in that, described cement paste is specially G level oil well cement or size is more than or equal to 800 object superfine cements.
9. the method as described in as arbitrary in claim 1-8, is characterized in that, is describedly specially along described second direction being carried described operating tool string:
Carry described operating tool string along in described second direction, make described bottom be in position along described second direction apart from described polymer solution top the 5th distance, and horizontal well described in backwash;
Carry described operating tool string along in described second direction, to the straight well section be connected with described horizontal well, and close described Christmas tree casing gate, to treat described cement slurry sets.
10. method as claimed in claim 9, it is characterized in that, described 5th distance is specially 10m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510616420.7A CN105257241B (en) | 2015-09-24 | 2015-09-24 | Method for cementing plug of horizontal well |
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| CN201510616420.7A CN105257241B (en) | 2015-09-24 | 2015-09-24 | Method for cementing plug of horizontal well |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105715229A (en) * | 2016-04-08 | 2016-06-29 | 陕西省石油化工研究设计院 | Suspended cement plug applicable to continuous oil pipe injection and application method of suspended cement filling plug |
| CN106639971A (en) * | 2016-12-06 | 2017-05-10 | 长江大学 | High pressure-bearing blocking method for perforation shot hole |
| CN106677739A (en) * | 2016-12-06 | 2017-05-17 | 长江大学 | Perforation blasthole blocking method |
| CN106703744A (en) * | 2016-12-06 | 2017-05-24 | 长江大学 | High-pressure-bearing plugging method for fracturing wellhole |
| CN107043617A (en) * | 2017-04-20 | 2017-08-15 | 长江大学 | A kind of embrasure plugging liquid |
| CN109403912A (en) * | 2018-02-27 | 2019-03-01 | 中石化石油工程技术服务有限公司 | A kind of method and construction method of the water injection of horizontal well bod |
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| CN109403912A (en) * | 2018-02-27 | 2019-03-01 | 中石化石油工程技术服务有限公司 | A kind of method and construction method of the water injection of horizontal well bod |
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|---|---|
| CN105257241B (en) | 2018-03-09 |
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